Generally - with a few exceptions - if someone is doing well on Betfair, you'd expect them to be spending their time making money, not selling their knowledge (and potentially diluting their edge in the process).
I'm not tarring all service providers with the same brush - I'm sure there are some genuine ones out there - but most are rubbish (and I've used a few over the years!).
IMHO, your best bet initially is to let the market be your teacher, and try to pick up tips on this forum and on the internet(although bear in mind that, just because a pro says something is the case, they may be wrong!). Also work on your self-discipline; trading is like dieting - simple but difficult - and the importance of focus and discipline cannot be overstated.
Good luck.
Jeff
JustLuckin wrote: What do you think of training courses, subscription services, etc - all place an overhead, are they worth it?